Signed into iMessage in more than one place?

Okay, this may be a bit hard to understand… :/

but on the iPad at home we use my cousins apple account.therefore we use his account on iMessage. He also uses the same account off his iPhone, so I was on the iPad and sent a picture from there to my iPhone using via iMessage (i have my own acct on my phone) and I deleted the message on the iPad i'm curious to know if he has received this message on his phone? Though I deleted it? :/

If it made it's way to his e-mail box then he should have it even if you deleted it.

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